LICHENS AND LICHEN. PARASITES

DODGE-LICHENS AND LICHEN PARASITES
for accura.te observation. The only ascospore I was able tq free in a position to measure, is evi-
deiltly old and shrunken. The length may bc approximately correct, but the diameter is certainly
too small. Some spores apparently still in the ascus seem to have one cell almost a hemisphere,
the other almost a cone, and very slightly constricted at the septum. Some of the perithecia have
been attacked by a mould. G.A.N.Z.A.R.E. B531-1 probably belongs here but is in much poorer
condition than the type.
Macqnarie Island: Highlands, Sta. 81c, B.A.N.Z.A.R.E. 13534-1, type; Featherbed Flat,
R.A.N.Z.A.R.E. 531-1.
COCCOTRENA Mull-Arg.
Coccotrenra Mull.-Arg., Miss. Sci. Cap Horn, 5, 171; 1889.
~ ~ : C. pcztcztrbitrrla e (Mont.) Miill.-Arg.
Thallus crustose, uniform, ecorticate, algae Trentepohlia. Perithecia single, or 2-3 sunk in
spherical thalline warts with a thin, hyaline wall and vertical ostiole; periphyses simple eseptate,
early gelified; paraphyses very slender and little branched; asci short. 6-8-spored; ascospores
relatively large, hyaline, unicellular, ellipsoidal.
This genus seems intermediate between the Pyrenulaceae and the Pertusariaceae; the
blackened outer wall of the perithecium, the periphyses and symbiont suggest the Pyrenulaceae ; .
the penetration of the algae between the outer and inner walls of the perithecium, the presence
of several perithecia in a thalline wart and the relatively large, thick-walled ascospores suggest
Perforaria of the Pertnsariaceae. Further morphological and cytological stlldies are needed to
clarify the sitnation, as we have been llnahle to study all the species concerned.
C~CCOTREMA RWGUELENSIS Dodge, sp. no\-.
Type : Kerguelen, Observatory Bay, B.A.N. Z.A.R.E. B192-1.
Thall~u tennissimns, uniformis, laevis vel subrimulosns, dilute brunneo-olivaceus, nigricansque;
ecorticatus; algae Trentepohlia, cellulis 4-5p diametro metientibus, longitudine
variabilibm, cylindricis. Perithecia 375p diametro, sparsa ; murus 60-65p crassitudine, strato
extero 15p crassitudine nigricante, aliter hyalinus, hyphis periclinalibus, gelifactis; strato
gonidiorum circiter 18p crassitudine in dimidia parte inferiore inter stratum nigrum exterum et
stratum interum; ostiolum ad 150p diametro; periphysibus gelifactis evanescentibusque; paraphyses
tenues, gelifactae pawi-ramosae ; asci cy lindrici 110 X llp ; ascosporae octonae, unicellulares,
ellipsoideae, 22 X lap, episporio crasso.
Thallus very thin, uniform, smooth or somewhat rimulose, light brownish olive and blackening
; ecorticate ; algae Trentepohlk, cells 4-5p in diameter, cylindric, of variable length. Perithecia
375p in diameter, scattered, wall 60-65p thick, the outer 18p darkened, the rest hyaline, of
periclinal, gelified hyphae : algal layer about 18p thiclr tapering gradually above and reaching
about half way up the perithecium between the darkened outer layer and the inner hyaline layer
of the perithecial wall ; ostiole relatively wide, abont 150p in diameter ; periphyses gelified and
evanescent; paraphyses slender, gelified, little branched; asci cylindric, 8-spored, 110 X llp
(immature) ; ascospores ~ulicellular, short ellipsoidal, 22 X 18p with a thick wall.
On rock with Verrwaria obfuscata, Coccocarpia kerguelensis, Lecidea phaeostm, Aspiciliopsk
macrophthalma ancl Btlellia tristbcula.
Crozet Archipelago : Possession Island, American Ray, B.A.N.Z.A.R.E. B20-1.
Kerguelen : Observatory Bay, ,B.A.N.Z.A. R.E. B192-1 type ; Molloy Point, J. H. Kidder -
( U.S. Transit of Venus Exp.).